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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 08-17-2016, 12:09 AM   #1
cwarel
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Backfire / exhaust pop tune /FLAMES?

So my car started to spit out flames ))) with the exhaust pop mod
I got ebay headers with no cats , mid resonator delete ( which is useless drones a little ) and stock muffler .
All i gotta do to make the car spit out flames is rev it out to max which is 6500-6700 rpm let go the gas and keep coasting down and when it reaches 4500 rpm THERE IS A HUUUUUUGE BANG and fire spits out of the exhaust about 1-2 feet , the bang is so loud its ear popping , checked the car in case of any damage , everything seems to be normal ( already got pulled over by the cops for the flame ( ez excuse car mechanic told me car misfires, didnt get a ticket )
The car is turning heads everytime i do that , people get scared as f*** , and 1 guy thought i shot him i rolled out of the car laughing ) anyways im gonna post a video once i get my hands on go pro , right now video is on my friends instagram

P.S i was looking at those JDM cars where they have a 2 step thing maybe we can implement that too
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Old 08-17-2016, 04:39 AM   #2
daniel_f.
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The launch control feature basically acts as a 2 step limiter. Its just not as agressive right now as i need to tweak the code.
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Old 08-17-2016, 12:11 PM   #3
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From the MS43 development thread here are my experimentation on the subject: I still need to make a video...


I went to a track day last week for the first time this summer and my modification bellow is AWESOME!

On the track when the exhaust get hot (after few laps) it make a loud BANG with a nice fireball (a lot bigger than in my video) every time I shift and sometime also when I lift my foot in the braking zone. It's pretty loud and put a nice show since I tracked at night. The flame and sound are really noticeable for the spectator I got a few positive comments! Next event I will bring the GoPro to show you guys.

I will redo my print screen when I will be at home, I played with the value of the timing.

If someone want to try it on the street it's working but you need to make the exhaust become really hot. You need to recreate the condition of few lap on the track! Note that it probably won't work if you still have catalytic converter...

Adam

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Originally Posted by Track_IT View Post
Since spark cut seem to be to much hassle (From Daniel_f expertise, I don't even know how to do that. BTW thank you for your response Daniel I appreciate!) I tought of an other way to spit flame with the E46.

For the first time I can contribute to this thread!

I decided to use the old trick of more fuel and retarded timing on overrun to get my flame.

Keep in mind that it's my first try tonight with guessed value to have flame I will improve this pretty soon. I will keep you guys posted.

I added more fuel in the low load high RPM range since from my logs it's where the ECU read when in overun at high rev. I also played with the negative throttle retard map so it has less retard than what we see on the wiki to be sure that the mixture is well ignited before getting out of the exhaust. It really need fine tuning but it's a great start. I've been messing at the same spot for 30minutes trying to make flame...kind of noisy I left before cops came!

Here the maps I played with:



Some videos:

Launch Control flames


Exhaust Pop

Last edited by Track_IT; 08-17-2016 at 12:12 PM.
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Old 08-17-2016, 06:49 PM   #4
cwarel
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Track TT , ur flames are blue , mines are red ))like a fire camp color
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Old 08-18-2016, 10:47 AM   #5
Track_IT
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Originally Posted by cwarel View Post
Track TT , ur flames are blue , mines are red ))like a fire camp color
On my video yes, it was the first day I was playing with this.

On the track recently it was doing huge fireball red/orange! The fireball was 1 foot long behind the car!
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Old 08-18-2016, 12:41 PM   #6
cwarel
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Originally Posted by Track_IT View Post
On my video yes, it was the first day I was playing with this.

On the track recently it was doing huge fireball red/orange! The fireball was 1 foot long behind the car!
Tried ur settings car wont spit fire at all and wont pop even tho i heated my ehaust by driving the car
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Old 08-18-2016, 12:57 PM   #7
cwarel
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Quote:
Originally Posted by daniel_f. View Post
The launch control feature basically acts as a 2 step limiter. Its just not as agressive right now as i need to tweak the code.
So ive never fixed a problem with my LC , and i found out why i think , when i plug my 330 ecu to romraider it shows it as 325 dont know why maybe previous owner has swapped the ecu and stuff , anyways ive heard that you fixed that LC for 325 guys but my car basically is 330 with 325 ecu that has 330 parameters on it , im asking you if you could fix that for me so , I can start tweaking 2 step , here is the file its for 330ci has lots of changes , thats the one that pops flames http://www.filedropper.com/exhaustpopsflame1
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Old 08-18-2016, 06:53 PM   #8
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Flames are fun
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Old 08-19-2016, 06:54 AM   #9
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All MS43 are basically the same. The model and engine type is hardcoded in the Romraider .xml-file.



@Andre How the hell did get these flames! I need something like this
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Old 08-24-2016, 11:28 PM   #10
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How do you guys shoot flames? I have headers no cats, y pipe to single straight pipe... Might it be my muffler?
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Old 08-25-2016, 11:21 AM   #11
cwarel
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Quote:
Originally Posted by UnBearable_Lo View Post
How do you guys shoot flames? I have headers no cats, y pipe to single straight pipe... Might it be my muffler?
The setti gs above didnt work for my car even didnt wanna pop with them i did everything he said ,so im just using settings i made that shoot flames with a loud ass pop but i gotta rev the cat to 6500 and let it go down in gear to about 4500
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Old 08-26-2016, 03:15 PM   #12
TheRiddle
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Mine did pop n flames since the day one of headers ( no cats/remus muffler)

I think 'cause is running a Lil bit too lean ...

Inviato dal mio SM-T705 utilizzando Tapatalk
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Old 08-26-2016, 08:37 PM   #13
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Originally Posted by TheRiddle View Post
Mine did pop n flames since the day one of headers ( no cats/remus muffler)

I think 'cause is running a Lil bit too lean ...

Inviato dal mio SM-T705 utilizzando Tapatalk

Well I think all of us with headers are running lean. But my thing is, I can get the pops every time I step off the throttle but I've just never seen any flames even under these conditions, maybe I just have to get a better tune or different muffler

This is my current exhaust setup
Click image for larger version

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Old 08-26-2016, 08:49 PM   #14
cwarel
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I havr stock muffler with 1 of the resonators deleted and in order to make flames I gotta go all the way up tob6500 rpm let off the throttle and let it go down to about 4500rpm and flames come put and also i got no idle control valve
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Old 08-26-2016, 08:59 PM   #15
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Quote:
Originally Posted by UnBearable_Lo View Post
Well I think all of us with headers are running lean. But my thing is, I can get the pops every time I step off the throttle but I've just never seen any flames even under these conditions, maybe I just have to get a better tune or different muffler

This is my current exhaust setup
Attachment 639433


No resonator means more pops and more rasp, I still have that,
usually mine throws small bangs only on shifting to 2nd or 3rd at full throttle and only when muffler is hot ( after long highway drive)
To make it pop I only need to apply 1%gas when decelerating

It depends a lot from the type of muffler, bastuck& Uuc are really "open" ,Supersprint, Remus are more tamed
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Old 08-26-2016, 09:01 PM   #16
cwarel
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Stock and ebay headers)))
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Old 09-18-2016, 04:21 AM   #17
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My flames
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Old 09-20-2016, 07:19 PM   #18
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dude would you please share your values so we can add it to the wiki


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My flames
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Old 10-08-2016, 06:01 PM   #19
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damn!! looks and sounds amazing
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Old 10-10-2016, 10:38 PM   #20
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I like it, but the sparks worry me. Cant do this anyway. Ms45
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